{"id":"53297324-04d2-4587-a6b5-592b8c41f72a","shortId":"xY8GhW","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/158` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/158` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific functionality of /api/v1/payments/158 ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/158","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. It is unclear what 'Premium API Access' at /api/v1/payments/158 actually returns, making this effectively a stub 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'/request':12,28,152 '0.02':11,27,69,151 '000':73 '20':72 '402':204 '6':79 'Base network API' 'USDC API access' 'accept':48 'access':64,92,218 'across':108 'actual':219 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,14,21,30,40,63,85,162,217 'attach':95 'base':8,24,53,74 'broader':104 'call':4,20,71 'categori':110 'challeng':205 'charg':66 'classif':125 'connect':171 'convers':142 'data':111,115,213 'decim':80 'descript':189 'detail':178 'doc':161 'document':156,208 'embed':126 'endpoint':57,107,145,194,198 'estim':136 'exampl':186 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'function':215 'gas':135 'generat':143 'geocod':140 'header':99 'howev':155 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':15,31,86 'label':61 'learn':120 'limit':89 'list':147 'live':200 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':119 'metric':113 'micropayment API' 'network':54 'no-api-key' 'offer':106 'openapi':182 'page':166 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,98 'per':3,19,38,70 'platform':6,22,41,82,105 'point':154 'premium':62,216 'price':129,153,163 'prompt':173 'protocol':46 'provid':220 'quot':134 'rate':88,132 'readm':165 'render':168 'report':114 'request':39,102 'request/response':185 'requir':16,32 'return':196,201 'schema':183 'sentiment':121 'simpli':94 'spars':159 'specif':56,195 'summar':124 'technic':177 'text':123 'token':133 'unclear':211 'unit':75 'usdc':49,77 'usdc-base-network' 'use':43 'util':139 'valid':141,203 'via':9,25 'wallet':172 'web3':128 'without':207 'x402':10,26,45,97 'x402 API' 'x402-payment'","prices":[{"id":"d2b60623-91eb-405d-9bc4-1c7ef52655dc","listingId":"53297324-04d2-4587-a6b5-592b8c41f72a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:37.780Z"}],"sources":[{"listingId":"53297324-04d2-4587-a6b5-592b8c41f72a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:37.780Z","lastSeenAt":"2026-04-24T07:02:55.462Z"}],"details":{"listingId":"53297324-04d2-4587-a6b5-592b8c41f72a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/158 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/158"},{"claim":"Platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/158"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.286Z"},"updatedAt":"2026-04-24T07:02:55.462Z"}}